What does the devplatform-utils malware do?

devplatform-utils@35.5.2 ships an index.js whose main module require()s _bootstrap.js, which on load downloads a platform-specific binary payload from string-split-obfuscated Cloudflare Workers endpoints (e.g. oob-worker.cf103-070.workers.dev) with a DNS-TXT fallback via *.dl.wel1.ru. The payload is written to /var/tmp/.cache_ on Unix or %TEMP%\dotnet_diag_ .exe on Windows, chmod 0755'd, and spawned detached via /bin/sh -c ' &' or cmd.exe /c start /b. Destination hostnames are assembled at runtime by.join('') on fragmented string arrays (_NODES, _DNS_MAP) to evade static string scans, and the dropped file is given cover-story names (dotnet_diag_*,.cache_*,.analytics_state). A

Which versions of devplatform-utils are malicious?

The following npm versions of devplatform-utils are flagged malicious: 35.5.2. Treat any of these as compromised.

How do I remediate devplatform-utils if I installed it?

devplatform-utils is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.

I already installed devplatform-utils — how do I know if it already compromised me?

If devplatform-utils was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Is devplatform-utils part of a known attack campaign?

Yes — devplatform-utils is associated with the IN-MAL-2026-015723 campaign. Packages in the same campaign often share infrastructure and payloads, so check whether any related packages are also in your dependency tree.

How do I find devplatform-utils across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for devplatform-utils (version 35.5.2).

Malicious package

devplatform-utilsnpm

Advisory published Aug 5, 2026Updated Aug 5, 2026

devplatform-utils is a confirmed malicious npm package (MAL-2026-13271) that steals credentials and exfiltrates sensitive data (malicious version 35.5.2). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in devplatform-utils (npm)

MAL-2026-13271

Immediate action

Remove the package, then rotate any secrets the build/runtime could reach.

npm uninstall devplatform-utils

What this malware does

[email protected] ships an index.js whose main module require()s bootstrap.js, which on load downloads a platform-specific binary payload from string-split-obfuscated Cloudflare Workers endpoints (e.g. oob-worker.cf103-070.workers.dev) with a DNS-TXT fallback via *.dl.wel1.ru. The payload is written to /var/tmp/.cache<hex> on Unix or %TEMP%\dotnet_diag_<hex>.exe on Windows, chmod 0755'd, and spawned detached via /bin/sh -c '<path> &' or cmd.exe /c start /b. Destination hostnames are assembled at runtime by.join('') on fragmented string arrays (NODES, DNS_MAP) to evade static string scans, and the dropped file is given cover-story names (dotnet_diag*,.cache*,.analytics_state). A rate-limit token stored at /tmp/.analytics_state (EXPIRE_SEC=21227, ~5.9 hours) causes the remote binary to be re-fetched and re-executed on subsequent require() calls, providing a persistent operator-controlled code-delivery channel. Environment variables DISABLE_TELEMETRY / DO_NOT_TRACK are checked as a cover story consistent with a legitimate telemetry opt-out. No hash or signature verification is performed on the fetched binary.

Malicious versions

1 flagged

35.5.2

Indicators of compromise (SHA-256)

0244bc7396ea5f52d909130a7d685fee98c0dda29cb18b82d17e8c9c90dff552

Detection & response playbook

Credential / info stealer

Find it
Search your lockfiles and build artifacts for devplatform-utils (version 35.5.2).
If you installed it — respond
devplatform-utils is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.
Did it already run?
If devplatform-utils was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Frequently asked questions

No. devplatform-utils on npm has been identified as a malicious package (version 35.5.2 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-015723

References

npmjs.com

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks devplatform-utils-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

Malware detection Runtime egress monitoring

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